http://www.kunsthaus.ch/en/the-collection/conservation/examples-from-the-world-of-art-conservation/egon-schiele/fig4/?redirect_url=title%3Dm%D0%A0%C2%A0%D0%B2%D0%201a%D1%161%D0%A0%E2%20ac%2122%D0%2019%C2%A9thod

Kunsthaus Zürich

Egon Schiele

Detail of the rear of the canvas: owing to the thick wax compound, the structure of the canvas can no longer be discerned.
Detail of the rear of the canvas: owing to the thick wax compound, the structure of the canvas can no longer be discerned.